Download Osteology andMuscles of Mastication

Osteology and the Muscles of
Mastication
Lecture #5
Mandible-lateral, exterior view
Mandible-lateral, interior view
Mandibible-Superior view
Cranium view
Maxilla-Inferior view
Muscles
• Origin-The stable anchor point of the
muscle
• Insertion-the anchor point that moves
when muscle is contracted
• Action-What happens when the muscle is
contracted
Masseter Muscle
Temporalis muscle
Medial Pterygoid
Lateral Pterygoid muscle
TMJ/TMD/MPD
• TMJ disfunction-Tempromandibular joint
disfunction
• TMD-Tempromandibular disfunction
• MPD-Myofacial pain disfunction
Subjective Symptoms
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Headaches
Jaw pain
Ringing in the ears
Pain with chewing
Grinding or clenching of teeth
Neck aches
Clicking jaw
Objective Symptoms
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Abnormal wear patterns on the teeth
Deviated path of opening or closing
Three finger rule
Tenderness in muscles, especially the
Lateral Pterygoid
• “Can you chew a piece of gum
comfortably”
• Headaches focusing around the
temporalis area or above the eyes
Demographics of disease
• Women have the problem three times as
often as men
• Problem often occurs after a traumatic
event
• Depression often comes along with TMD
• High stress people (Type A personalities)
• Certain jobs which compromise posture.
(ie computer jobs)
Clicking of the jaw
Treatment of disease
• Conservative versus Aggressive therapy
• Aggressive
– Surgery
– Orthodontics
– Crown and Bridge or new dentures
• Conservative
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limiting use of the joint
anti-inflammatory drugs
physical therapy or massage
Exercise
splints to manage grinding
emotional counseling
anti-depressant drugs.
NTI appliance
Methamphetamine-Lower anterior
Methamphetamine-Upper anterior